Dry shaver cutter head



July 27,1943. T. J. MURPHY 2,325,267

DRY SHAVER CUTTER HEAD Filed Sept. 24, 1941 4 Sheets-Sheet 1 IQVENTOR w s wj-w ATTORNEYS,

July 27, 1943.

T. J. MURPHY DRY SHAVER CUTTER HEAD Filed Sept. 24, 1941 4 Sheets-Sheet 2 TH 145 /05 1L INVENTOR g, I M 5/ 31 ATTORNEY$ July 27, 1943. T. J. MURPHY DRY SHAVER CUTTER HEAD 4 Sheets-Sheet 3 Filed Sept. 24, 1941 ATTORNEYS July 27, 1943- T. J. MURPHY 2,325,267

DRY SHAVER CUTTER HEAD Filed Sept. 24, 1941 4 Sheets-Sheet 4 M7127. .4 44 [3 i5 4w w t F K me M7 ATTORNEYS Patented Jul 27,1943

. "nam DRYSHAVER'CUTTER HEAD Thomas J.- Murphy, Stamford, Conn. 3

Application September 24, 1941, Serial No. 412,055

In Canada September 27, 194.0

Y n M 19 Claims: (o1. 20- 43).- This invention relates to dry shaving devices and has for an object to provide an improved dry shaver construction which will operate more efiectively and efiiciently to rapidly cut thehairs close to the skin without injuring or, irritating the skin. i

end of the casing in which the cutter head may 7 be mounted and showing how it may bacon- With the foregoing and other objects in iew I have devised an improved construction asillustrated in the accompanying drawings forming a ,1

part of this specification. It is, however, to be understood that I am'not limited to the specific details shown but may employ various changes and modifications within the scope of the inven f tion.

In thes drawings:

Fig. 1 is a partial side elevation an'd'a partial,

section of the cutter head on an enlarged scale;

Fig. 2 is a top planview. thereof;

Fig. 3 is an end view with parts broken away I to more clearly show the construction;

Fig. 4. is a bottomplan View of th cutter head;

Fig. 5' is a side elevation oi the center. comb or guard removed from the head;

Fig. 6 is an end view thereof Fig. 7 is a sideelevation of. a filler block ployedintheheadpfl I l.

Fig. 8 15a. partial end view and partial section thereof;

Figs. Sand 10 "area. longitudinal section. and

end viewrespectively of a coverfmember for the inner end of, the actuating stud; I

Fig. 11 is a top planviewot one end showing -modification;

a few of the teeth of'thestationary guard on 'one' side of the central comb or guard;

Fig. 12 is a view looking toward thefbottoin of Fig. 11; H Fig.13 is a transversesection substantially on' line. I3'l3 of Fig. 12;

Fig. 14 is a view similar slightly different construction; I

Fi 15 is. a partialendview'and a partia1' sec-* tion of the inner or movable cutter;

i 16 is a top plan viewf'of one end portion thereof to FigQll showing7a Fig. 17. is a view looking toward the. free'en-dsi of the teeth of Fig. 16, the View being taken sub:

stantially on the line HI'I of Fig; 16;

Fig. 18 is a bottomplan'view of onejendof this movable cutter;

Fig. 19 is a view similarfto rigfiz showing modified construction;

Fig.2!) is a section. looking irornjthe right r? Fig.19; Fig. 21 is a vertical central section ofthe'head the construction;

nected' to an o perating motor, the cutter head shown being somewhatmodified'from the conf struction shown in Figs. 1, 2 and 3;

Fig. 22 is asect ion takenat right angles to g I 4 Fig. 23 is a partial side elevation'ahd partial section, of a somewhat modified constructionof cutter head;

Fig. 241s a top plan view thereof; Fig. 25 is a bottom plan view thereof i Fig. 25 is an endelevation with a portion bro-f ken away to more clearly show the construction;

Fig. 27' is a top plan View of one end portion on a larger scale;

Fig. 28 is a top plan view of one 'end' portion.

of the inner or movable cutter;

- Fig. 29 is an-elevational view-lookingtowardf the upper row of cutter teeth:

th free ends of in' Fig. 28;

Fig. 30is an end elevation'of the'cutter of Fig. to more clearly show 28 with parts broken away Fig. 31 .is a detail view looking toward Fig. 32 is a transverse section ori anenlarged scalethrough'the upper portion through one of the side plates forming the outer or stationary cutters Fig. 33 is a similar section showing a'slight Fig. 34 is a side elevation of the spacing block 1 and comb guard; I

Fig. 35 is an end elevation thereof Fig. 36 is a top plan, view of the securing spring 2 the cutter head in the motor hous for holding ing; 1

Fig. 37 is'a side elevation thereof; I Fig. 38 is a partial side elevation andpartial sectionof the operative connecting ineansfbe tween the actuating motor and the movable c'ut-' ter;

Fig. 39'is a top plan viewon an enlarged scale of a modified construction ofthe outer stationary guard 'or cutter teeth; i y

Fig. 40 is a View looking towardthe free ends of these teeth on a still larger scale;

Fig. 41 is a transverse section substantiallyfoni l.

line M4|, on Fig. 39;,

Fig. 421s a top plan view of the v thejfree ends of the cutter teethat one end portion of the .1 head, the view being taken substantially on line] "blank from which theconstruction of Figs. 39 tofl l is made' showing the eficct secured by the'fi'rst operation;

. necting drive from the motor or activator 1 bars and the" blocks; "It will be apparentQthat...

43 an edge View thereof looking toward the bottom of Fig. 42.

F g. 44 is a partial side elevation of the head end of the casing and cutter head therein showing a somewhat modified construction;

Fig. 45 is a transverse section thereof substantially on line 4545 of Fig. 44. 1

, g. 46 is a side elevation of the head of Fig. 4; v

Fig. 47 i'sa bottom view thereof; Fig. 48 is anend view thereof with parts broken away to more clearly show the construction; n

Fig. 49 is a partial end view and partial section of one of the side members or plates of the; housing; Y

Fig. 50 is a bottom view of on blocks ofFigs;44 to 48; v 1 1 V Fig. 51 is an end view thereof I Fig. 52 is a side elevation of one form of tothe e of the spacing inneror movablecutter;

Figr53 is a bottom view thereofi Fig. '54 isa side View of a .digfie'rentconstruc can of connecting drive. from the.'rnolt'or toLtheL= tt' r; I 3 1 1. Fig. 55 is abottomviewithereof; 1 I Fig. 56 is a transverse section ofon e of they spring- .members oLFigs. 54 and 55 taken substantiallyon line 56 -56 .oflFigr .I :f.

Fig. 57 is a face view of one of the backing;

up elements of Figs. 54 and 55, and. I i;

Fig. 58 is a similar, view of the other backingupoelements this construction. l

Th'is e pl t de i I is .acontinuation fin partof... mylprior application Ser. INo...i5l,'13, nied- July 3, '1937, and which issued Decembe 2.1 1941, as. Patent.No.-2,264,398. j

Referring first toHFig s. to. inclusive, this cutter head comprises two side/members 6 each having atiiits uppe'r. edge inwardly' extending stationary guard and cutter teeth I. 'Tl iese fsidev members .6 are. held in proper spaced relationlby at the undersides of the teeth I of the stationary guard. In the outer surfaces of the side walls the walls are cut away forming longitudinal channels i5 leaving longitudinal reduced bearing surfaces I'G against the side member 6 thus reducing the friction and permitting easier operation. It also facilitates the oiling of the bearing surfaces. Also there are ground longitudinal channels ornotches 13b at the outer ends of the teeth or'outer'sidej corners or edges or the .cutter leaving a space between the inner cutter and the inner wall of the outer cutter 6 and providing sharp edges I at the opposite edges of this space to prevent a wedging action on cut hairs which might vvork into this space and prevent these hairs working-into the space between the inner cutter teeth i3 and..the outer cutter teeth 7 to v l thusgcauseaiseparation of these teeth and inter- COIVIT- fere with the proper shearing or cutting operationa -It-has been found that with the inner cutten fitting the outer with a rounded. corner cut liairs ,will work in. between the! movable and stationaryteethn This cutout l3bwi1lals'o pref,

vent. .hairs' workinginto the. bearing surfaces. it. "The bottomIwalllIof thisv memberfhasa tapered recess IT '(Fig. 1)' to receive the tapered end f'lfi,

two intermediate longitudinally spaced. blocks: 8:

at the opposite endscf the head" andbetweenlthea side members .6, therebeing transverse pin 9 extending throughwthe side members mama. b1o'cks,.and the sidemembers being secured to,

the blocks by soldering; Either 'lthe linner tir-[$ 1 faces .of the side. plates. 6. or .theopposite sides of theblecl rslfl. are rec'e'ssedlas indicatedllat 10,, with. tapered. curvedi recesses Lto.- receive 1 solder}. ing'i'n'aterial H and insure carrying of the soldeii' tothecontacting surfacesbetween the side when once assembled this makesagvfery strong rig'id construction "whichalv-iays .Inaintains. the

, tially. rectangular passagaor. channel between theftops. offthehlociks IBQLand the v.underside of,

the stationary guard and butter e'e'thhl 'g. Moiint-v edin this channel and reciprocable longitudinally therein is the inner of n cvablel'cutter gi g. This reciprocating.cutteris. f substantial. rectangu: lar cross section'with inwardly extending cutter. v teeth. |3.a long the upperedgs dfthe side wan These,teeth shownin Figs. Band 15 are islighte r of anoperating pin or, stud. L9. for reciprocating the. cutter II 2, this actuating stud being operated by: an electrical actuator'as. will later be described;v

30 it is preferred. to place 'overgthe' free .end. IS a substantially U -'shaped plateor cover to prevent cut hairs getting into}; the bearing between the) studandfthe reciprocating-.cutter. The bottom of thisco'ver'is recessedas'shown at 2i to'seat on the end of the stud andh o -ld the cover in place. The. distance between the, side walls of this coverl'are substantiallythe distance between the sides of the 'cuttei f asfshown in Fig; 3, so that it is properly, positioned. in the cutter and prevents the As indic 1. extend. nwa dl romihempper edge o t e side members 6 toward eachgther, butjthe free ends are spaced fromeach other leavingga' longitudinal slot 22. These teeth may "be of various shaLpesQthose shown in Figs; Zand'l'l' to libeing of v substantially triangular shape as shown, in Fig.' 12, the angle between the adjacent inclined sidewallsindicated atZ, being preferablyabout' "lqdlalthongh this may, vary, and the distance 24 betweenthe'centers o'flthe teeth being about'.022

ofan inch and leaving es ate between the edges ofthe teeth iofabout .012 inchjas'indicat'edat 25 butwhic'his preferablyltapered slightly inwardly "as. indicated- I am, not limited v to these 'dimen sionsbut it has'been found from experiment thatv thesepermit,cuttin gof the hair close to the skin without'permitting the skin to project sufficiently into the space betwecntthe teeth to cause irri-' tation' of the skin"by themovablecutter. It=will of course be understood that. the tliinner the teeth the less strength jor ngidity'. and therefore the depth of the notches 25 between the teeth and the length'of the overhanging free portion 'of the teeth will be limited.- However, the greater the'depthof thejnotches 25' the more readily the hair will enter between the teeth to be cut off,

bythe coactionof the'sharpsideedgesof the teeth 70,! and the'side" edges of the teeth l3,,of the mov-V ablecutter.v I have found as indicated Fig.' 14 thatI may make alternate'n'otches betwee'nthe teethdeeper as shown. atzayor as shown'fin' Figsf24 and 27; without 'objectionablyweakening 1y i ei r es e ir ig-i iefli eii fieltri li era e? nd. tiring. unsh ne-rea y a e s 91? ni t'ihairsi: get neiinto; the bearated above the stationary cutter teeth meza sev.

the hairstotthezspaeeibetween thesteetlto to give.

better and:2fascer:fshaving.. flimsy-arrangement:

gives aextra strengthvwhm'eifche: .teeth snare-fierythin andtithusnpenmits thevusezof thinner teeth to secure; clown-shaving? Invassembling itris preferred j-thatx :thegshohtemnotches' 2 5':in.rone' setv ofiiteeth' beiopposite.th vlongertnotches 28.;in the:

otherisetxon themppositeisideqof the central1ongi-tudinah slotii ZZvsOZthat: as the: head. .is vmoved backnandkfonth onvtheflskinz the-longer? notches.

oI'-:-.=teeth will take therlonger hairs .the

shontemnotchesvzor teeth the: shorten hairs. The

trough-v. omspaee between-the teeth is. continued baekwardly; f omothee inner". ends of 'thezznotches 25-iandiifinasrindicated-zat121-,.:-eitherato run outn g in .thetopsurfa ce ofiythengua-rdj'mernbers 0l"xflll the .-ou te1 ;edges ithereof. -As iindica'ted; however, Lam not limited tortheruse" of substantially angular, teeth;.-but as shown in'Eig. .19 these iteeth indicated atjla, may-be substantiallyrectangular in;cross--;see1 zion;givh1g somewhat greater rigidity.

about thetsame level as the outer surfacez of the stationary -guard teeth 1 This: central guard tween th firee' ends of the cutting te'ethtwi-thont danger of the=skin= entering sufii'oientlyto -be=-out -01 irritated an'dat thasajme time this wider epac- .ihg permitsmore ready entrance of the hairs into ciittingposition; thus v grea tlyl increasing-the speed *of the shaving:operaitionmwithout n'oreasingflthei danger} ofziir-ritatiom to the skin. Also; in:- th e s'h' ving opera'tiom i "is customary'uto move the e tter head back iorth over theshinre'lative ly short: movements in 'a direction;

a transversely or thefcutte'r" head or "that is, -long.ij-'

Itsisutol bemnderstood. thattheside edges at the lowerg surif aces-z of; the teeth cooperate-with the edges .-.of .-.the teeth.- 13 uni-the; movable cutter to give. a. shearingv effect -for cutting 1 the hair-the same-.as .-in.the first fmfm andz this-shearing ac-; tion-is irnpreyed hy:,slightlytapering themotches betweenq-the teeth -so--that the side-op oat-ting edges are inclined. ..It#; will be noted thatin neithersoase raretrthe ,teethi iormed in'th'e: side members GU lean I p -tsmthe; ends. thereof, but. that asubstantially. .flahor, :plaini surface. 2 8 islet-t2 at eachs-endaandthathitsis preferably somewhat higher than? the outertsunfaces. of. the teeth I I or. lc to formla guiding surfaceagainst the surfaeeofuthe skin; andithus prevent :the teeth from being pushed toodeeply-intoqtheaskin and. prevent cutting or irritating the skin. Elie-teeth I 3.- on the movable putter, mayshavesubstantially sti 'aighte sides;as;indieated in. Eigs.-.'16- and 17; or

- and stil1l1fur'tlier preferably threevor four. times this. pitch, or. equalto or greater than some. multiple"of.ft11e .1iit 2h{.of eitherset ofrteeth is .iniportant in. securing. better: operation. ;Tl'1is is especially true wher'e fthe 'dwe11 at eachextrema. offthe cutters movement vis "short as [is truein the type of 'activator shown in my. prior app1i cation-Serial No 359,349, 'file cl' Jaimary 13., 1939.

"Therem'ay also providedin the longitudinal slot-'22 betweenthefifi'ee edges of the teeth 1on5 gitii'dinallyextending-bomber "guard 29. jThis' is of a thickness l ss than the distance between the free '-"ends-o'fthe teeth so that its opposite sides are spaced from theseteeth i and; 03 as shown in: Figs Z and 3, and it-also preferably on i-ts upper' free edgetransvers'e teeth 39 which are preferablycin' 'alignmentwith' the: stationary teeth |-;and=.of about the same width or thickness. The

edges: of 51211858 rteeth;:. are-t preferably located at mama-11y of -the cutter teeth; -and 'it=is ou'stomwry in reversing the -direetion oi movement :to rock the-head laterally somewhat} on thegsurface erraging theehin."" This'cezitral guard or. comb 29 acts as a ol'zt of guarpP-and"fulcrum-on which this w rocking takes "place and io permits the" rocking movement-without-rernoving 'e'itherset of cutter teeth: from 'the sui face of! the skinend thereby preventing proper shaving.

, asshown ini Figs. H2; 5 aridfi. Iii has-downward;

Iy extending end fpo l tions 3 and 32. The-"end portion 3243 Split as shown at and has a trans- 'verse-opening 34; for 'one o f the pinsi passing transversely thron'ghfthe sidemembers 6: an the 'oiv'oted'hn this pin, the block 8 havingi a' 35 extending inwardly froinf i-ts *end "in which the portion 32 is' inserted. 5T0 git'e a friction en the-sides of tliiiswsl'ot' to m'aihtain 'the guafd' i'SE theslot 35 i't is brought ba ck ihto the plane of-lthe mexhben -placing'qthe lug fiila undertension,- so

that theeesmem action -of the metal causesa pressnre on opposite sides of theslot 35, maintaining the guard in proper position. i The oppo- I site-'"enmportion'fil has a -n'otohefi to seat-over the-pin" fi-om'the opposite end of the head. "This notoh is es: slightly- "less widthlth'en the "diameter of-"this-pin9 so that as it is forced-down over theinn the lugsmr 63182011 the-opposite sidesbf Q the slot are f orced laterally away from each other a "short distance, which aetionis' permitted by the out? Lll; thus placing the lugs tinder tension; end the resilient" action be the metal' fri'cti'onally "en gages 'the pin to hold the guard 29' in position. 1: its opposite efids the'gtialdZH is extended beyon'd theends-o-f the-"side members- 6 as shown iIi'Figs. 1= aiidi 2; these extensions lo'eing' indicated] edges andHorm-a-sort' of guide and guard'cluring the shaving operation and the lower shoulder 48 provides-iat'ifingen grip toIpermit' lifting of "the endftfi of -the"guarcZ--"to'='s'wingithis end about the oppositmbinifi. as"a;piV0tl1;ofe oose the guard for cleaningz'andialsorpermit cleaning of .the interior Ofi'lthG cutteriand:of 'therc'uttingete'eth. The bottom-Mal}; I either. movable cutter ll 2 has a; longi tiidin'alnslot .452". att ea'ch end' thstra-d'dle therp'ortions3'3l: 32"01 .thetguar'd or'oomb me; her :29 anduperrnitthe' longitudinal reciprocating m'o-v'e I mentiofthe cutter 42." The'dnn 'endslofthese slots. 62: are-inclined asiindicatedlya 43in prevent accumulation of out hnirs zinithe slot and-permit easyznlearing-thereof. 1 .'=It ."Will be; seen ithatj ifromt his arrangement there isoprovideda shaver which'rwillibe equally efieotivecimeach: of 'itstmovements in" opp osite "directions so the device-maybe,operated'by moving. it back and ;forthiov er the surface ,to bev shaved. The, two rows of teethon the opposite sides of slot'22 forrngin effect two. opposed cutting devices extending or facing in opposite directions and spaced from each other the widthofthe slot 22. Each of these'cutting devices-includes a set of, guard orguide teethand a set of reciprocating or cutting teeth cooperating therewith, both sets o1. movable: cutter teeth being on the reciprocating cutter I2. -Therefore as-these cutting devices arerhelcl against 1 the, surf ace-i of the skin and the head is moved overthe surface back-and forth in adirection transversely of the slot 22, first one cutting device'on'0ne, side ofthe slot operates as a shaving device, and thenwhen it is moved in'the other direction the other'cutting device thatas one set oithe shaving-teeth on one-side I of the slot is movingforwardly in; the. cutting direction the other-is moving ahead of it and againstthe surface of the skin, and therefore form a guide to always maintainthe teeth which are doing the cutting at the proper angle with relation to thesurface of the skin for the best cutting effect, and prevents digging into the slnn, To secure this proper angle all the userhas to dois to hold the outersurface of the cutterhead squarely against-the surface of the skin The longitudinal passage within the moving-cutter l2 collectsand conducts the. cut off hairs from the shaving teethsothey are kept clear at all times. v 3

Tosecure the cutting efiect it is of course necessary that the-cutter I! be reciprocated in a-directionlongitudinall -of-.the-slot 22-, or that is transversely of the guard teeth I, and immediately-back ,of-the guard teeth and be held against theback t-of these teeth for the proper shearing effecti -The amount of movement'of the cutter .IZshould be at least equal to the distance hetweentheteeth 1', or it may be. severaltimes the amount; li -desired. TheJteeth' -Of the movable cutter lzareiheld against the back of the static-nary, teeth .1 by a, spring similar to spring 9! acting onpin 50 as shown in Fig'21 pressing theoperating pin I! against the movable cutter, i2. This-maintains the proper pressure between theteeth; and automatically takes blocks asshown more clearly'in Fig. '34. 3 After thedevice is assembledthis comb or guard is thereforealwaysmaintainedlin its original posi tionandthere isnov danger ofits being shifted out of this position and not properlyreturned to it; This also assuresalignment of: the teethfla c-f'this guard onfits outeredge with the'teeth' "a oizthe stationary guard or outer cutter 'teeth.

It is preferredto use teethon theTguard-ill but itimayibe used Iwithoutteeth if d'esired. It is also prefcrred-toextend the ends of the central guard or comb 544 beyond theiouterf'end's'of portionstt and. round themas shown at b as these rounded endsof -the'l-vguard prevent-the skin contacting the sharp-corners of the outer cutt'er eiements and eliminate the necessity of making Jpo'rtions 6 6 raised {'abovethe outer sur faceof the outer cutter'teeth. In assembling this head the two blocks are formed in one-piece plates' 'l and the blocks 45. 'Afte1" ,theplates are assembled-and soldered to the 'blocks'-the connection or tie bar Nils removed by sawing it across adjacentfthe inner ends of'the blocks -15, the lower edges of the 'plates'4 1 being provided withnotches'fl to accommodate the saw. This leaves'space' for the operatingpm 50 from the actuating motorto the innenrno'vablecutter 5|. The blocks 8 "of Figs; -1-gto 4 may beassemp1a in the same manner, using the connection 46' to hold them 'ini position until assembled with the side plates 6 and then'removing the connection 46 in the manner'described'. This manner, of

assembling makes it easien'to get the spacing blocks 8 and 45 moreac'curately and properly positioned, and also msuresim re accurate and proper assembly; 1'?- The inner cutter "is thesame 'as thecutter l2 as shown inFigsY'Pto and 15 to '18 except that instead of having anotchmats lower wall 51a at both ends it has'iahotch 5lb jat'one end only to'acco'rnmodatethe supporting standard 53 of the guard or comb 44', This has an .additional advantage or function in combination with this meansof mounting thewmbtrgua'rd in that theinner cutter s ea b inserteddn the head in one positiononlyfand this prevents the inner cutter being reversed and placed in thehea'df wrong end topwith the possibiliti'of the teeth of the "innerfcutter 'not being in the proper relation to the teethof the outer cutter.

Theshape of the teethfila'of the outer guard or'stationary cutter 'is sori 'ewhat difie'rent, from I that of the cutter heau'mri sii to 3, .As shown more clearl in Figs, 27, 32 and 33, the freefends ofthe teeth are pr'ovided with'extrametalat their tips and itmay be onf'the'louter skin e ag ng side as shown'atf52' or n th i im gp underside, or divided'be'tweenthetwohTI'his is several thousandths 'of'a n inch thicker than the body of the tooth, and during the finishing op erations, of bufiing andpolishi ng some thousandths are removed so that ,this extra metal presents a rounded blunt end to, the skin a that does not puncture or irritatejitinuse; It also actsv asalcanopy over the sharp ends of: thein ner moving teeth I3 to prevent the skin from contacting these teeth. This extrathickness whilethe remainderofthe teeth remainsthinner gives an arrangement which will-permituse- The; iulltlin'e: thickness at: 53vindicates= the: shape of the. teeth aiter the buffin'g andrp'ol-ishirtg. T The body or rear pc-rtionof the teetlnindicatedatfl can have a thicknessofnGOZb-r .003: inclt'to give an extremely' :close shave' The thickness: 51:01? the tip may be about .010 inchpbut as vindicated above; bufii-n'g and: polishing wi11 removesome thousandth's and also round offthe corners ;.-leaving an extremelysmooth-approach; "In" tha -form of Fig. 32 there is a ara-ther abrupt 'depressie'ntfi at the thin-portion. of the-teeth giving'a thicker supportat the base 511' This; howeverg-may' be omitted-as shcwn-in-Fig'. 38- so that-the thinner portion ofthe toctlican be carried-bacl -t6--the body-of the plate. 1 1 Th -dimensionsmf course rhaywary but' t'he fl1owing',-by-"way of examplewhave been found verysatisfactory. Thusyfoh example; the'piate 41- ma-ybe' about 1031 in thickness and'the lehgth of the tooth Ha indicated" at 5B may-be "about The thickness of the toot'l r--'at*5 i,-'=as i-ndi- .060". cated-above;=-may be about 63 adjanenttd-it's free end and tapers'slig-htly' to about" 1064" 'atits sworn-1. It w'iILbe-seen ithat there isla shortinot'oh Sfic onsthe opposite-sided aptoothidfma from; the longesttnotchfiflmt "so as to strengthen and stifien thiszztootluiifan'dzi fact-by this: arrangement of variousalengths ofateetheand: notcheg thetteetltzare maternally- A strengthened and-x: stifieneda asthe metalicomes upafarther on oneside thereofithus ,permitting thezuse:ofmnchthinnenteth.andgivingtcloser shaving; o. It is also preferred rinnass'errr. bli'ng thezside. pl'atestotfithe outer'scutten" thatith'e longer; notches on .lspacess'fiflat b z. oppos te the 'shortestlslots 681;; thusathezshortestkt'eeth are onlposed to-the 'alon'gest teethisoxthat; ins-going back and forth-ion thesliinI the: 1on-gev:-teeth :or: cutting edge ion the longer notches. will: cut the5.1onger hairsx-and the:shorten:teethaornotches: wiilitcut the shorter 1hairs';.. Ais'oi. the shorter: spaces; :or

' notchesalibeingopposite. :.the\ longer l-spaees= -'=or between the teeth-maybe ab-out= .035';andthe width of the increased-thickness?! indicated at 61 may be about" .OIOL The 'widthoi the de pression 56 Fig. 32' as indicated-at may be about .035") The width orthe slot orspacing betweenthe teeth--is preferably"abGutfiOIO" as notches? wiltitend toiprevent the skin iezrteringzthe longer spaces i sufficiently itotcauseiirmtationrpari.

ticularlyrwhere thiszarrang'ementsissusedwithout a central guard or comb. Although this arrange-- mentxfi's shown\iimFigs; =24e and12 E onlmit" is-to be understood? it' m'ay be use'd 'in the other=- cutter head'sishowni.

"At the opposite en'ds of the-cutter ahead-hare providetllsubstantially; wider-guard andguide sur faces 663 to] assist i inpreventing the-flteetm digging intoathe skinmoirritaterit. .As s'hown in Fig. 3-1

preferably about the 'same'as that of the" stationary cutter teeth-4m; It is alsoprefeir'ed ab0ut'10 degrees; This h'asbeen found-to perrrrit the cutter tomoveslrro'othlyand evenlyfover :the skin surfaceand'tdsortof' draw ititofa uniform smooth condition and permit it to'enter between the teeth" justsufiiciently'to "give' a; goodfclose shave withoutirritating the skin: 'It' also fafcihtates entrance of the" hairsto' proper cuttingpo siti0n.'

Improved'operation'is' securedby the-arrange- Inent showni'n Fig. 14' by making-alternate-teeth in the stationary guardof diiferent-lengt-hsyor putting'it another way; makingthe alternate notches or spaces between"- theitee'th-of different lengths; This-adds strengthtotheteethpermiti ting the useof' thinner'teeth'and securinjg a closer shave. This effect-is :stillirirther increased? shown 'in-"Fi'gsv24 and 27,'bymaking adjacent teeth or" the notches between-adjacent teeth of different lengths and; placing the shorte'rvspaces or'notches adjacent-to or ontheoppositeside of the tooth at oneside 0fth longer notches." Thus as shown in-thes e'figuresthe notches arem'ade of three; difierentleng ths with a longer notch fita and-a shorter notch next-to'it Gob-and arstill shorter notch nex-tto that-fi 0c, and themanctherlong notch Mayan-intermediatenotch 56 and tliisue'xtends; beyond the extreme movements" 0f t i -end tooth [311 not: thew-inner c'utter 51. i As withi tlrei'type' 'ofactuatowdisclosede the strokeof the inner cuttezfimay vary'withith load; being so-metvhafio'shorter. for heaviers load'sj-if the under side of-z this.extensionv were for :itsiiulls width: on a .l'evelzwith under sideiofithe teethiliin; .itxwiil'i b'e evident that ibecauseiof this'4variati0nzin:stroke there. would; eventually bezunev'en :wear-on th'eun- .ner: stxrfacwof portion; 68,. so that onz th'erlonger movementgcof the;-. inner @cutter the-. outer: itooth shittz the'inner: cutteriteeth: .awayf'fronuthe: outer cutter-teeth andxinterfere Withthepropen cut 1 tirigiofz? the haih:v To \(ibViMiBifihiSiithi :undei: SULCJ- fa'c i ofiltheextensiorrsfifiiis relieved o-mcutisback awayfronnthwtoothdMasindicated 2x 61 in Fig'. Bilato aipoi-nt oversialppingrztheuton-th zltwiatthe pointaotits extremeamovementieven omtheshontest strbkefofi theiinnencuttenz. This-'insuresxthat the :wear onrthe innersisurface :01: the-..und

ject to the same amount of wear, giving uniform wear:ongallzcontactingasurfacesbetween theiteeth v otithemovable and stationanwcuttersw Thussthe teeth; of the two cuttersfremaimim pro-per relative positionseindefinitelypu 1 i A inoclifiedoonstnuctiom0tthe:outenstationary outterza These are-formed on 151ates*.68 corresp0nliingzto fireside plates era-name ot-the previousiform's, and:are hiounted on- 't'h'e. opposite sides: -ofathe spai "iocksi 8 and lfii the-same as in the pne "viou-s for'rhs. pertion eXtending i'a-terally' inward: o-vemne spacin blocks the same as in thepreviousdorms,

his p'ortion 6i? are fbrmed the stationary u i s omewh'at 'diffrent shape than in the othu orins'. -Ass-ho-wn' 40 they are ofz. the-il-teethifld i and: the: extension; B-B which I are engagedtb'y the inner movable teeth arehall sub I guard teeth is shown-in: Eigssiigi toAB.

At 'the' up'per or outev edgeisa cutte teeth "mi In this fdrm,-- however, 'these r wa-lls of thes'e cross 'bars te 00'- cutter 12.. The leg or rib 14.:ext'ends longitudinally at the outer or skin'contacting side of the teeth and preferablyat substantiallythe'center 'of the tooth." These ribs add strengthand-stiffness..to the teeth. and form themain skin contacting surface, preventing the skin entering. too far into the notches 12 between theteethto'be cut or irritated by the .movable cutterteeth l3. In'making this cutter. the portion 6911s substantially. plain asshown in dottedlines Fig. 43. :.Be+

forehardeningand while'still soft,zthe grooves" 7.5; are milled or broached of properwidth and spacing to form the rib .14.. Then :after the metal is hardenedand tempered the notches 12 are groundinto the connecting Wallsat the bot:

tom'of the groove between the ribs 14; andthen the surfaces are. all. buffed andpolisned, which rounds off theouter corners of thfiql'ib Hand body:.or cross bars H as'well .as the freeends of the teeth and the ribsgiving a smooth con:

tact with the skinandtminimum irritation to the The dimensions 1 ofcourse may varyebutithe following have been found to be very satisfactory.

The thickness of the ribs indicatedaty'll'rFig. 510 may;be about .0061, the thicknessof the cross baryindicatedat 18 about .003", .the,width.of the cross bar indicatedat.19,about;.;015f';the width of the slot between the teeth indicated at '80 about .010",, and thetotalheight-indicated.at 8| I The depth of .the slot Hindi: cated at 82. is about .035.,toj.p040..' The thick? .also about .010".

ness'.003" for the .bar H and. the ..010".',, f0r the total thickness are substantially uniform along the entire length of the tooth,'th'eribs '14. giving suflicient strength and stiffness to; permit this. This permitsvryfastor quick shaving. While. in the various :forms illustrated-- an uneven number of teeth is shown on the inner c11t.

.-.ter in relation to the number of .outer .cutter teeth, an .even'or :like number. can be used.' The first arrangement causesthe. teethtocut in succession instead of .all atonce, thus reducing the power required and greatly reducing, the: liability ;of,.s talling;. It is preferred: because of the rela.- ,tlVGlY long travel of the ,inner' cuttercelement adopted in thisparticular shaver, that :the width of the inner teeth be somewhat-inaexcess of the opening between the outer teeth. Thus for. ex:

ampleit has been found satisfactoryto make the width of teeth l3 as shown at 13a Fig...28-about -.0,15" and the distancel3b between them about There maybe a slight differencenintheangles ofithe contacting surfacesof the teeth of the in? her and outer cutter. elements, ,Thus for example there may be a slight difierence in the angle of inclination. of. the inner surface I 4 (Fig. 13) of the outer teethv and the angle of inclination of the outer surface I3a (Fig. 15) of the teeth [3 of the inner. cutter element. Similarly in Fig. 32 there may be a slight difierence in the angles of the inner. .surfaces 41a of the teeth l3 of the outer cutter and in Fig. 33 between the angles 'of the inner surface 64 of the outer teeth and the outer surface of teeth I In the same Way in Fig. 41,

there may be aslight difference-in the angles of theinner surface of teeth H and outer surface of teeth I3. With the extremely thin outer teeth which it is possible 'tosecure With-{the present a construction these teeth wouldspring back under slight pressure as they .are pressed against the .skinto conform to the widerangles-on the teeth .of the inner cutter and be s upported thereon.

.So that no catching would occurbetween the re isusually made of some molded plastic and in two sections suitably connected together to enclosea suitable operating motor 64. This may .be -of different types,- but as indicated is that shown in my prior application Serial No 0,349,

filed January 11, 1939, as anA. C, oscillating motor, having suitable-wiringandpole mem bers for oscillating an armature-11101;. shown), which through the yoke 85 oscillates the driving pin connected to the yoke by the threaded stud 86. In the arrangements shown the lower end oi the-studfli passes through the yokey and. bar-8Q and isthreaded into the bart9. It

.. is held against loosening by a lock nut 80. A

spring 9] reacting against this nut and ancollar 92 on the pi'n 5il tends to-hold the'rounded or,

s emi-ball shapedend of this: pin in the recess .93

' in the bottom wall 5I a of the inner movable cutter. In ass emblingp the drive pin 86 is Y threaded and forced into a formed hole in the pin 50.? This will assure'a perfect fit in'the out- .er. drive pin'. A stiff grease is packed around "the threads to eliminate allinois e and rattle The housing 'hasa transverse groove 34 in which the cutter headis mounted. It is held in this groove by a retaining. spring 95. This is shown more in detail in Figs. ,3f6 and 37, as Well as in Fig} 21. 'It has abody portion 95 seating on the bottom of groove and has" an elongated opening 91 through which the driving pin 50 projects. At the opposite ends of this opening are inwardly projecting '1 retaining fingers 98 which pass through the opening 95 in the bottom wallof the groove in the housing and; are folded'over, at their ne ends lflll' onto their ner surface of the wall bf his housing to retain 'the' spring in the groove. The opposite ends of the spring are bent downwardly and backwardly to forn loops l0| 'and'I OZ andprovidespring fingers l.03'and. I'M to'grip'the opposite ends of the cutter head to retain it, in the groove. The free/end portions ofthe'se fingers are reversely bent at ts toseat in notches ms (Fig, 34)to retain the head inthe groove. The shape lot the spring when free is vshownin Fig,. 3'l, When applied in the groove in the .housin'gfit is straightened and'the'refdre stressed as shown in Fig. 215 that the ear's will grip the wall or the housing. One. end'fin ger such as for example finger I03, is tightly closed against the endof the bodyportion 9 6 as shown {in Fig/2 1 and preferably is preloaded so that when the cutter head is slipped into position betweenthis an;

gerand the finger I04, the finger'llld will yield to clamp the head between the fingers as shown inFig. ,21. This will i'nsurethat -.a lthougli the head is tightly grippedby thespring fingersit is always positioned in ,the same relative position {inthe housing by-thefinger M3, Allv the forms of cutter heads shownlcan be; mounted the. usi eby is-s me g ippin mean it bethe ends oft the cutterwhead'; in; theform show in Fig, 1 as.--well as-the o.theri or1ns.=.

, Somewhat; modified-constructions are shown imFigs; 44-to 58.*;- In: Figs. elito 51-. the-spacing blocks IGI- are: made from stampings; of; sheet metal-instead of-pbeing-substantially solid blocks asxshown: in the I other forms, ,The development ises-hown lI11-FlgS; 50" and-151;, in.-which as indicated the side 'portions Iflfiiof: a plate. of proper gauge orzthickness is; bent. laterally into substantially' parallelirelation to form the sidewalls I03; andva lugyIIll at one=end is bent laterally im the same,- direotion-toifor-m theend wall; H I. These blocks-i are; used the; 'sameras the blocks 8 and 45 of-Fig s; .1 to 8 :and 21=;to 25,;3i and 35,

to spacethe side. plates- -;I 1'2: having their upper edge portions inclined; inwardly toward each otherand providing. stationary; cutter teeth i 53 corresponding to the-stationary cutterteeth in the. other forms: In this arrangement the; re-

cesses II4 for holding; the-.solderxll'i: and supplying it to the-,coniracting;.surfaces; betweenthe blocks and plates are iormedin the. side plates lliaby pressingpa portion: of thew alls outwardly as indicated at H6, and the side plates are soldered :to --the sides of the. spacing blocks it] the-same as.- in thesfirstiorin; This forming of the. recesses'in the-inneii surface of the. side platesby pressing outtheiwalls forms-ribs. i-it on; the outer. surfaces of the side: plates which may be'slid. into: grooves I I,I i of corresponding shapeand width. on theinner sides .ofthe transverse groove 94-in the aportioniiw ofthe inc1os-' ingcasing-.83;,-thus forming; a convenient means dependingon the spacing between the two rows ofteeth. Ifethe guardifl is used it may he fastened at one -end .to'.- one :of; thespacer blocks I 61 as indicated at I20; the-same as in the arrangement shown in Fig. 21 andtheinner movable cutter 5.I will. be-slottedatlb so as to embrace this-.connected-end as shown in Figs. 21 and 23,

theother endgof the :guard M being free the sameas in Figs. .21; and 23."

Figs. 52 to 581 show somewhat different operative connections from-the activator or motor to=the--movable cutter.5I.- .Thus-in Figs. 52 and 53 astud- I2 I=is threaded'into the bottom wall 5lafofthe-cutterandhas a rounded or semiball shaped'end I22.--seated in a similarly shaped reoess-vinra' spring-I23 formed by -pressing laterally-aportion I2d=of'this spring. The spring has an" intermediate portion -.I 25 :with one arm I26 bent backwardlyi over it in: which therecessedportion. I2 4.is:formed. Theother free end-.portion iTZT'maybe connected byany suitablemeansl23= with thelmova-bleyoke 83 '(Figs. 21,-and22) of1thexactuator or motor. Whenzas: sembled=thespringiisstressed so that it presses upwardlyon pi-n I2:I tohold th-e endof-this pin in the-recess in the spring and pressing .theteeth. I 3 on this movable cutter against the under sides of thetee-th' I I3-;of theouter or stationary I cutter to=seouree the properishearingeffect.-

In: Figs. 54;110I3h8: driving. pin I29 2 has a rounded;.-or sen i-bal lrshaped end IQ-Q-Seatedain asimilarly 'shapedi recess 'I 3I- in' thebottomiwall Eula-of -the;cutte1.'. This pinhasareducedfpor tion IZSarpassing through. two verticallyispaced springs IS-Z'and I33; the springs havingtopen ings: I33d thereth'rough'to:v correspond withvthe diameter of 1 the reduced: portion. 6 This forms a shoulder I-tfi againstawhich spring I33 seats; A

spacingsleeve- I 29b=embraoes the reduced portion I290. and the two; springs are-clamped by aa screw I34; The :springs are stressed so that they; press; the end-of the pin: .Iiiizinr the. recess I3]: and hold it therein, andalsohold the teeth E3 of the inner cutterti against the under sides of the-teeth'l l3z'ofuthe outerrcutter. Theiouter ends ofthe springslflt and" Ittfare bent: downwardly. toformlik-e portions lttrand I3 respectively clampedsby means-"of. a 'bOIti i38 between stiffener plates;- I39fand= I40; and-:alsotoi secure theplates to any'suitab-le: driving connection Mlconnected to. the yoke tE oi the-actuator or motor. The plate I39. has-a sho-rtyoacki'ngr-up extension or; tongue I 42: engaging, the inner side or". the leg portion ldhqwhilerthe plates Idil have longer. lugsror extensions M 3 .engagingathe. leg

portion I3? of the spring. I33; these extensions backing up and. stiffening .01" supporting: the spring, .The horizontal portion. of the springs can be stiffened also-by providing themzw-ith a v longitudinal offset-.rih M-mressed into these portions; [These driving connections of. Figs. z52 and; 54 are simpler-than the driving-pin connec-: tion Shown in Figs. 2l-and 22sandithereiore are preferred. They :arezalso easier to assemble, but

they both act to yieldingly press teeth 13 onthe inner cutter-against the innel'jsides of thes teeth of the outer cutter to secure the. propergpressure betweenithemand give the iproper'shearing aetion -"V, I.

-The structures of cutter heads described. are very eiTective in giving a clean rapid; shave and cutting the hair. close to, the skin. without cut.- ting or irritating the-skin Also. the; structure of the head comprising-.- thegspaeingblocks-and 1 separate side plates secured thereto onwhich the stationary skin contacting guard and cutter teeth are formedgreatiy facilitates the manufacture, and particularlyfaeilitates accuracy in cutting and finishing-these outer stationary teeth to secure proper dimensions and'aiso proper fit in relation to the inner or movalaie cutter teeth to insure effective cutting operations. and will insure that the accurate andiproper fit will be maintained indefinitely. I 1

Having thus set forth the nature of my invention,".wha t I claim is "1. In ahair cutt adapted to pass'over theskirij rereading hair .comprising a pair of long itudinally spaced-mounting. blocks, members secured to the opposite sidesof/the blocks'havingafreegedge: portionsLeXtendt-v I ing-iaterally toward eachether;'andiinolined out.- wardly awayfrom the blocks aha, sufficiently small angle so that-their. outer; surfaces simul+ er, a skin contacting member portions each having arow of stationary cuther teeth with the free ends of theteeth in each row extending toward the other row and spaced fromthe free ends thereof to provide a longitudinal slot between them, a cutter mountedbea tween 'said'members for longitudinal reciprocating movement and provided with two longitudinal spacedrows'of cutter teeth at the inner surfaces of the stationary teeth and movable trans versely thereof and means located between the blocks for connecting the cutter with an actuator for operating the cutter." V

3. In a hair cutting deviceof the character described, 'a cutter head comprising a body having on one face two spaced rows of stationary teeth facing in opposite directions with their free ends toward each other and inclined inopposite direct-ions backwardly and away "from said free ends, the free ends of said teeth having additional metal makingsaid free ends thicker than the bodyof the teeth, a 'separate 'set of cutter teeth cooperating with each row of stationary teeth, said two sets-of cutter teeth being spaced from each other with the free ends in each set directed toward the other set, and means for reciprocating the cutter teeth in a direction transversely of the stationary teeth.

4. In a device of the character described, a

cutter head comprising a body having a longitudinal passage adjacent one outer Wall with a longitudinal slot in said wall communicating with said passage, the opposite edges of said slot cm for reciprocating the cutter in a direction longitudinally of the slot. '-5. In a hair cutting deviceof the character described, a cutter headcomprising a body'having at one edge two spaced rows of stationary teeth facing in opposite directions with their free ends toward each other, a'sepa'rate set of cutter teeth cooperating with each row of stationary teeth,'said two sets ofcutter teeth being spaced from each other with the free ends of the teeth in each set directed toward the other set, a central stationary guard between the free ends of the teeth and spaced therefrom, said guard being permanently secured to the body at one end and detached and spaced therefrom at its opposite end to permit insertion of the inner cutter between the guard and the body, and means for reciprocating the inner cutter in .a direction transversely of the stationaryl'teeth. 1

6. In a cutter head, a body having a pair of s'paced'toothed edges forming stationary cutters and arranged with the free ends of the teeth facing each other, a cutter in the body movable relatively thereto and havingteeth cooperating with the teeth of saidedgesfor the cutting. of hair, a stationary guardbetween saidtoothed edges and spaced therefrom, said, guard being permanently secured to the body atone end and .free and spaced therefrom atthe other end to tan'eousl'y engage the skinsurfacasaid'free edge tudin al slot leading fromfonel n to embra 'mit insertion of a movable cutter between-the guard and the'body, and a cutter mounted between said plate members for longitudinal reciprocating movementand providedwith twolongitudinal spaced rows of cutter teeth-atthe inner surfaces of the stationary teeth and movable transversely thereof andsaid cutter having a 1on gitudinal slot extending inwardly from one end only to embrace the attached endp'or'tion of said uard.

' 8. In a cutter head of the character described, a body having a skin contacting surface with a series of transversely extending closely spaced stationary teetharranged with'their free ends scribed, a motor casing having a transverse permit insertion ofthe cutter between the guard j at one edge of-said surface, saidfree ends having additional metal on theouter'skin contacting side to make said free end portions of-greater' thickness than-thebody of the teeth, and a movable cutter having a series of spaced transversely 9. In a cutter head, a' mountingblock,'a' plate member secured to oneside of the block, one edge portion of the plate member extending beyond the block and inclined inwardly thereover, said inclined portion having a'serie'sof closely spaced stationary teeth to engage the'skin thefree ends of said teethhaving additional'metal to make said free end portions thickerthan" the body or the teeth, and a cutter havinga series of spaced teeth at the inner sides of the stationary teeth andmovabletransversely of the stationary teeth to cooperatetherewith'. 1

10. In a cutting device of-the character 'de' groove at one end to receive a cutter head, there being an opening in the bottom of the groove for passage of an operative connection from the motor to the'head, a spring member seated in' the bottom of said groove and; having fingers 'ex tending through said opening and overlapping the walls at the inner end of said'opening to secure said member in the groove, and-said mermber' including resilient fingers at the opposite endsthereof having holding means to engage shoulders at the-ends of the cutter head to retain said'head in "the groove. 1

'- 11. In a cutter headof the"-character-described, a bodyhaving askin-contacting surface with a series" of transversely extending closely spaced stationaryteetharranged with their free 'ends at one edgeof said surface, wider skin'engagi'ng guidi'ngportionsat the opposite ends- 0f said -s'e'- ries, a movable cutter havingla series of-transversely extending teeth engaging the inner sides of the stationary teeth and movable transversely of the stationary teeth to cooperate therewith for the cutting operation, and the'under sides of-said wider guiding portions beingrelieved beyond and ments are spaced outwardly of the outer p01 tions of these movable teeth.

12. In a hair cutter, a skin contacting member adapted to pass over the skin for cutting hair therefrom, said member being provided with sets of opposed teeth having free ends extending toward but not reaching each other and separated by notches, certain recurring notches between the teeth being deeper than other adjacent notches to provide longer cutting edges, said sets of teeth being arranged so that the shorter notches in one set are opposite longer notches in the other set, and a movable cutter provided with spaced sets of similarly opposed teeth having free ends extending toward each other operating at the inner sides of the other teeth and movable transversely thereof and cooperating therewith to cut hair from the skin as the member is passed thereover.

13. In a hair cutter, a skin contacting member adapted to pass over the skin for cutting hair therefrom, said member being provided with two sets of opposed teeth having free ends extending toward but not reaching each other and'separated by notches, the successive notches between teeth being of different lengths to provide cutting edges on adjacent teeth of different, lengths, and a movable cutter provided with spaced sets of similarly opposed teeth having free ends extending toward each other operating at the inner sides of the other teeth and movable transversely thereof and cooperating therewith to out hair fromth skin as the member is passed thereover.

14. In a hair cutter, a skin contacting member adapted to pass over the skin for cutting hair therefrom, said member being provided with two sets of opposed teeth having free ends extending toward but not reaching each other and separated by notches, the successive notches be-' tween teeth being of different lengths to provide cutting edges on adjacent teeth of difierent lengths, said notches being arranged in series with the longest notch, then a shorter notch and a still shorter next to it, then the longest again, a shorter and a still shorter and so on, and a movable cutter provided with spaced sets of similarly opposed teeth having free ends extending toward each other operating at the inner sides of the other teeth and movable transversely thereof and cooperating therewith to cut hair from the Skin as the member is passed thereover.

15. In a hair cutter, a skin contacting member adapted to pass over the skin for cutting hair therefrom, said member being provided with two sets, of opposed teeth having free ends extending toward but not reaching each other and separated by notches, the successive notches between teeth being of different lengths to provid cutting edges on adjacent teeth of different lengths,

said sets of teeth being arranged so that the,

shorter notches in one set are, opposite longer notches in the other set, and a movable cutter provided with spaced sets of similarly opposed teeth having free ends extending toward each other operating at the inner sides of the other teeth and movable transversely thereof and cooperating therewith to cut hair from the skin as the member is passed thereover.

16. A cutter head of the character described comprising laterally spaced side members having free edge portions extending laterally toward each other, said free edge portions each having I a row of stationary cutter teeth with the free ends of each row extending toward th other row and spaced from the free ends thereof to provide a longitudinal slot between them, a movable cutter member mounted between said members for longitudinal reciprocating movement and provided with two longitudinal spaced rows of cutter teeth at the inner surfaces of the stationary teeth and movable transversely thereofv to cooperate with the stationary teeth to cut hair,

the spacing or pitch of the movable teeth being different from that of the stationary teeth andnot a multiple thereof so that they cut in succession, and means for shifting the movable cutter eachstroke a distance in excess of the pitch.

of one set of teeth.

a row of stationary cutterv teeth with the free endsof each row extending toward the other row and spaced from the free ends thereof to provide a longitudinal'slot between them, a movable cutter member mounted between said members for longitudinal reciprocating movement and provided with two longitudinal spaced rows of cutter teeth at the inner surfaces of the stationary teeth and movable transversely thereof to cooperate with the stationary teeth to out hair, Q

the pitch of the movable teeth being different from that of the stationary teeth and different teeth facing in opposite directions with their free ends toward each other, an inner cutter having a separate set of cutter teeth cooperating with each row of stationary teeth, said two sets of cutter teeth being spaced from each other with the free ends of the teeth in each set directed toward the other set, a central stationary guard extending longitudinally between the free ends of the teeth and spaced therefrom, the free edge of the guard being provided with spaced transverse teeth to prevent the flesh of the user enbeyond the ends of the body and curved backwardly to form a guide and guard during shaving, and means for reciprocating the inner cutter, in a direction transversely of the stationary teeth.

19. A method of assembling a cutter head for a hair cutter comprising forming two spaced mounting blocks in one piece connected at one edge by an integral'strip or tie bar, clamping against the opposite sides of these blocks a pair of members having free edge portions spaced from the blocks extending laterally toward each other and each adapted to be providedwith a row of stationary cutter teeth, soldering said members to the blocks while so clamped, and then removing the strip or tie bar by cutting it across at the inner ends of the blocks.

moms J. MURPHY."

17. A cutter head of the character describedf 

